Wine brings pleasure. But for some it can also prove painful. Red wine is particularly problematic for a proportion of the population, with just a few mouthfuls bringing on swift and excruciating headaches.Now scientists think they may finally be on to why. In lab experiments, they've identified a compound in red wine that impedes the breakdown of alcohol by the liver and causes a build-up of toxic acetaldehyde in the bloodstream. Human trials are still needed for confirmation - but these are...

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